Records reviewed by The Associated Press show that OSHA issued the West Chemical & Fertilizer Co., as the plant was called at the time, a $30 fine for a serious violation for storage of anhydrous ammonia.

OSHA cited the plant for four other serious violations of respiratory protection standards but did not issue fines. The maximum fine for a serious violation was $1,000.

It is not unusual for companies to negotiate lower fines.

The explosion near Waco, Texas, killed as many as 15 and injured more than 160 others.

OSHA has jurisdiction over more than 7 million workplaces. It's not uncommon for some companies to go years without inspection.

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